Reuters reports that "as America re-engages with Iraq and deepens its involvement in the region’s web of sectarian conflicts, the Pentagon has made a practical assessment of the brutal job of stabilizing Baghdad: in the future, U.S. forces may be needed on the front lines."

"President Barack Obama has ruled out a combat mission, but military officials and former officials say the reality of a protracted campaign in Iraq and possibly Syria may ultimately require greater use of U.S. troops, including tactical air strike spotters or front-line advisers embedded with Iraq forces."

"That raises questions over how far Obama can go in the expanding U.S. military power without appearing to violate promises not to drag America into another ground war and highlights different priorities between the White House and Pentagon at the start of what looks to be a long, unpredictable military campaign in Iraq and Syria."